Взаимодействие плазмы с поверхностью

Постоянный URI для этого раздела

https://openrepository.mephi.ru/handle/123456789/12266

Сайт конференции

Новости

В коллекции включены полнотекстовые сборники конференций НИЯУ МИФИ, а также статьи авторов НИЯУ МИФИ. Сортировка "По названию" позволяет вывести сборник в начало поиска.

Обзор

Просмотр Взаимодействие плазмы с поверхностью по Автор "DELLASEGA, D."

Теперь показываю 1 - 1 из 1
  • Уменьшенное изображение
    Публикация
    Открытый доступ
    DEUTERIUM RETENTION IN DENSE AND DISORDERED NANOSTRUCTURED TUNGSTEN COATINGS
    (НИЯУ МИФИ, 2017) OGORODNIKOVA, O. V.; RUSET, C.; DELLASEGA, D.; PEZZOLI, А.; PASSONI, M.; SUGIYAMA, К.; GASPARYAN, YU.; EFIMOV, V.; BALDEN, M.; MATERN, G.; KOCH, F.; Огородникова, Ольга Вячеславовна; Ефимов, Виталий Сергеевич; Гаспарян, Юрий Микаэлович
    Three types of nano-structured tungsten (W) coatings were investigated in respect to deuterium (D) retention after the low-energy D plasma exposure. The D depth profile was measured up to 6 μm by nuclear reaction analysis (NRA) and the total deuterium retention was measured by thermal desorption spectros-copy (TDS). In the present work, we investigated (i) a dependence of the D retention in a W coating on substrate, (ii) a dependence of the D retention in a W coating on the nano-crystalline structure, namely, columnar-like or amor-phous-like, and (iii) the D retention at an interface between layers. It was shown that most of deuterium is trapped in the interlayer between W coating and substrate. Consequently, the D retention in the interlayer between different materials can be a concern. It was found that all types of coatings show higher D accumulation compared to bulk polycrystalline W. The disodered W coating produced by Pulsed Laser Deposition (PLD) has highest deuterium (D) concen-tration compared to dense W coating produced by Combined Magnetron Sput-tering and Ion Implantation (CMSII) technology and W coating produced by standard vacuum magnetron-sputtering (SMS) method. The lowest D concen-tration was found in SMS-W coating. No significant influence of the substrate on the D retention in coatings was found. The D retention correlates with mi-crostructure of multilayer W coating: the D retention drastically increases with decreasing the grain size. Consequently, from point of view of the hydrogen isotope retention, coarse-grained crystals are recommended for application of W-based materials in fusion devices. At the same time, coarse-grained crystals are undesirable from point of view of blister formation under the plasma expo-sure. Nano-crystalline structure of W coatings suppresses the blister formation. A compromise in the development of new promising nanostructured tungsten films is necessary to keep the hydrogen concentration at an acceptable level and reducing/preventing high density of defects at the interface between nanostruc-tured coating and substrate.